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How to add/remove MacOS Dock separator#

There are 2 ways to do it.

Using CLI#

It is not possible to add a native, non-empty vertical line separator to the macOS Dock using standard commands or settings. That means the only empty space could be added into Dock as a organizer. This approach uses command line:

Add separator#

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defaults write com.apple.dock persistent-apps -array-add '{ "tile-type" = "spacer-tile"; }'
killall Dock

Remove separator#

To remove separator just Right click on it and choose "Remove" in context menu

Using workaround#

  1. Create empty file and change extension for '.app'
  2. Move this file into appropriate location (e.g. main Application folder)
  3. Change application icon for an "Vertical bar" or something you like to see as an separator image
  4. Put this Application onto Dock